millones a billones (pregunta tonta)

English translation: (UK) one thousand million or billion (US) billion

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I humbly ask for an apology. I was just based in the books and the teaching experience I have, which has always been the same in text books, and I even commented this in my answer. This has been a really good experience for me and I thank you both for it.

Ultimately I wanted to verify my conversion factor, and I turned in the translation, based on the comments here, including a note that I was aware that the UK was using bn. in some documentation. I was asked by the client to change the numbering to billions! This should teach us to be more questioning... O sea, no es el caso de quien confunda los millones con billones, sino de que a veces el cliente quiere algo diferente. John, I am indebted to you.

Not quite so simple. See Oxford Dictionary and Fowler's Modern English Usage. In the UK a billion is increasingly used in the American sense of a 1000 million - especially in technical writing and journalism.